CN110596544B - Partial discharge test platform under power cable frequency conversion series resonance - Google Patents
Partial discharge test platform under power cable frequency conversion series resonance Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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Abstract
The invention discloses a partial discharge test platform under power cable frequency conversion series resonance, which comprises: the device comprises a variable frequency power supply, an excitation transformer, a voltage divider and a reactor; the variable frequency power supply generates a sine wave of resonant frequency, the exciting transformer boosts output voltage, the reactor and the cable test article form an inductance-capacitance series resonance loop, and the voltage divider measures the voltage of the high-voltage end of the cable test article; the device comprises a partial discharge sensor, a current transformer, an acquisition unit and a data processing unit; the acquisition unit acquires a voltage divider output signal, a partial discharge sensor output signal and a current transformer output signal; the platform is based on the signal propagation characteristic of cable partial discharge, utilizes the ultrahigh frequency sensor to detect the pulse interference signal generated by the variable frequency power supply as a reference, detects the pulse signal flowing through the cable grounding wire as a main signal through the high-frequency current, and realizes the filtering of the pulse signal and the extraction of the partial discharge pulse signal through the comparison of two paths of signals.
Description
Technical Field
The invention relates to the field of insulation state and fault diagnosis of electrical equipment, in particular to a partial discharge test platform of a power cable under variable frequency series resonance.
Background
The cross-linked polyethylene (XLPE) power cable has been widely used in urban transmission and distribution networks in China due to its excellent electrical and mechanical properties. In order to ensure the safe reliability of the operation of the power cable, the insulation performance of the newly completed power cable engineering must be tested through a voltage withstand test. The variable frequency series resonance voltage-withstanding method is considered to be the most effective voltage-withstanding test method at present due to the advantages of small equipment power, good equivalence with power frequency, high feasibility of field implementation and the like. In addition, industry standards recommend that cables withstand voltage while performing partial discharge testing to detect the presence of latent defects in the cable system, such as cable body blisters, splice accessory air gaps, semiconductor protrusions, and the like.
Compared with the prior art, the patent number CN00259594.X, the Chinese utility model named variable frequency resonance power supply discloses a variable frequency resonance power supply based on SPWM modulation, which has small volume and high efficiency, but has strong pulse interference signals generated by a switching device, and the key point of partial discharge detection under the condition lies in the extraction of partial discharge pulses; the Chinese invention patent with the patent number of CN201210010921.7 and the name of 'cable partial discharge signal detection system and method' provides a partial discharge test method based on a series frequency modulation resonance system, the method uses detection impedance for testing partial discharge signals, and utilizes the high-pass low-resistance characteristic of the detection impedance method to inhibit power frequency and low-frequency signals of resonance, but pulse interference generated by a frequency modulation power supply contains wider frequency domain components, and partial interference signals can not be filtered by the method, thereby interfering the test result; in order to further inhibit the interference generated by the variable frequency power supply, the chinese invention patent No. cn201210190992.x entitled "series resonance withstand voltage partial discharge test method using frequency modulation and phase shift" uses a variable frequency power supply in a square wave modulation mode, limits the interference signal in a two-quadrant and four-quadrant phase interval, and performs partial discharge test by using the characteristic that the partial discharge signal appears in one quadrant and three quadrants, but the offset of the test system can increase the reactive output and the interference pulse amplitude of the variable frequency power supply.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a power cable partial discharge testing platform under variable frequency resonance based on the combination of an ultrahigh frequency sensor (UHF) and a high frequency current sensor (HFCT). based on the transmission characteristic of a cable partial discharge signal, a pulse interference signal (excluding the partial discharge signal) generated by a variable frequency power supply is detected by using the UHF sensor as a reference, a pulse signal (including the interference signal and the partial discharge signal) flowing through a cable grounding wire is detected by using the high frequency current as a main signal, and the pulse signal is filtered and the partial discharge pulse signal is extracted by comparing the two signals.
Specifically, the partial discharge test platform for the power cable under variable frequency series resonance provided by the invention comprises the following contents:
the test platform structure:
the resonance is withstand voltage and partial discharge test platform includes: a variable frequency resonance system and a partial discharge test system;
a resonant withstand voltage and partial discharge test platform is built, as shown in figure 1, the variable frequency resonant system comprises a variable frequency power supply, an exciting transformer, a voltage divider and a reactor. The variable frequency power supply generates sine waves with resonant frequency, and the output modulation modes include SPWM modulation and square wave modulation. The exciting transformer converts the output voltage of the variable frequency power supply to kilovolt high voltage, the reactor and the test cable form an inductance-capacitance series resonance loop, and the voltage divider measures the voltage of the high voltage of the cable to serve as an output adjusting signal of the variable frequency power supply and a trigger signal of the partial discharge device. The partial discharge test system comprises a UHF sensor, an HFCT (high frequency computed tomography), a high-speed acquisition unit and a data processing unit, wherein the HFCT is a current transformer. The high-speed acquisition unit is provided with at least 3 acquisition channels for respectively acquiring a voltage divider output signal, a UHF sensor output signal and an HFCT output signal, wherein the UHF sensor is a partial discharge sensor; the data processing unit processes and stores the original data (including narrowband interference removal, pulse extraction and interference pulse elimination). The UHF sensor adopts a flat antenna and is used for collecting interference pulses of a variable frequency power supply. The HFCT is in a snap-in mode, and the cutoff frequency of the HFCT is not lower than 15 MHz. The output of the variable frequency power supply is connected with an exciting transformer, the exciting transformer is connected with one end of a reactor, the reactor is connected with the high-voltage side of a voltage divider and a cable core of a test product cable, and a cable shielding layer is connected with the ground through a grounding wire. The HFCT is buckled on a grounding wire or a cable body led out from a cable terminal, so that the interference of a variable frequency power supply and a cable partial discharge signal can be collected simultaneously. The UHF sensor faces the variable frequency power supply and faces away from the cable test article to keep a distance d from the variable frequency power supply1And a distance d from the cable specimen2Considering the free space loss of the electromagnetic wave signal as:
L＝32.4+20×log(d)+20×log(f)where d is the propagation distance in km and f is the frequency in kmIs MHz. When the pulse interference of the variable frequency power supply is radiated to space with 3dB attenuation (power attenuation is 50%), the distance is about 6.7cm (f is 500MHz), so d is taken1<5cm，d2>1m, the partial discharge signals in the cable test article are guaranteed not to be detected by UHF due to long-distance attenuation, and meanwhile, only the interference of a variable frequency power supply is detected. The UHF and HFCT sensors are connected to the high-speed acquisition unit through coaxial cables and then transmitted to the data processing unit.
Function of the data processing unit:
(1) pulse extraction of two paths of signals;
firstly, filtering out narrow-band interference in an original signal through software filtering. And then, respectively carrying out pulse extraction on the two paths of original data of the UHF sensor and the HFCT through a sliding time window. Setting a threshold value Vth1、Vth2And the time window length TwThe sliding step length is Tw/2， Vth1Is 2 times of white noise amplitude of signal measured by UHF sensor, Vth2Is 2 times of the white noise amplitude of the signal measured by HFCT, TwTake 1-2 μ s. And taking an absolute value of the original signal, intercepting the acquired data by using a sliding time window, comparing the absolute value with a threshold value, recording the initial position of the time window as a pulse initial time when the data in the time window is larger than the threshold value, continuously moving the sliding window backwards until the data in the time window is smaller than the threshold value, and recording the initial position of the time window as a pulse termination time. Sliding the window to the end of the original data ends the pulse search. And finally obtaining UHF sensor and HFCT pulse and index sequence: pUHF＝[P1； P2；…；Pm]；PHFCT＝[P1；P2；…；Pn]；LocUHF＝[L1,L2,…,Lm,]，LocHFCT＝[L1,L2,…,Ln,]In which P isiRepresents a pulse sequence, LiThe index of the corresponding pulse in the original data is m, the number of pulses detected by the UHF sensor is m, the number of pulses detected by the HFCT is n, and n is more than or equal to m.
(2) Interference pulse cancellation
Determining the position of the pulse signal collected by HFCT and the UHF stationJudging whether the positions of the acquired pulse signals have intersection or not, namely judging LocHFCTi∩LocUHF(i∈[1,2,…,n]) Whether it is an empty set or not, if it is an empty set, note PHFCTiFor effective pulsing, the Loc is reservedHFCTi(ii) a If it is not an empty set, then note PHFCTiFor disturbing pulses, deleting PHFCTi、LocHFCTi。
(3) Partial discharge source discrimination
Extracting P by collecting 100 sine period dataHFCTAnd drawing a local discharge phase spectrogram by using the single pulse peak value and the corresponding index, and judging the type of the local discharge source according to the spectrogram mode.
In the technical scheme of the invention, in order to reduce the equipment cost, a detector can be additionally arranged behind the UHF sensor, so that the requirement on the sampling rate of the sampling device is reduced; in order to reduce corona interference, a voltage-sharing ring is additionally arranged at the high-voltage end of the reactor and a cable test article, and an anti-corona wire is used as a connecting wire.
One or more technical solutions provided by the present application have at least the following technical effects or advantages:
1. the invention has no specific hardware improvement requirement on the variable frequency series resonance system, and for the variable frequency power supply, the modulation mode comprises but is not limited to SPWM modulation, square wave modulation mode and the like, so the method has good applicability.
2. The configuration mode of the double sensors is simple and easy to realize, and the requirement on the professional technical level of a tester is greatly reduced.
3. The method is based on the noise cancellation technology of the double sensors, realizes the filtering of the strong interference of the variable frequency power supply, and has simple and easily realized algorithm.
4. The invention is not limited by the voltage grade of the cable to be tested, and can be matched with the power cables of the resonance systems with different voltage grades to carry out voltage-resistant and partial discharge synchronous tests.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention;
FIG. 1 is a schematic diagram of the test platform of the present invention;
FIG. 2 is a schematic flow chart of a partial discharge testing method under variable frequency resonance of a power cable according to the present invention;
FIG. 3 is a diagram of an interference pulse waveform acquired by UHF and a pulse waveform acquired by HFCT at the same time according to embodiment 1 of the present invention;
fig. 4 is a graph of waveforms (without pulse signals) extracted from HFCT to partial discharge pulse waveform and UHF acquisition at the same time according to embodiment 1 of the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflicting with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described and thus the scope of the present invention is not limited by the specific embodiments disclosed below.
Example 1
The partial discharge test flow under the variable frequency resonance of the power cable of this embodiment is shown in fig. 2, and the model of the tested product is YJV22-26/35-1 × 95mm2The length is 4 m's power cable, and the built-in size of near-end cable terminal is 100mm 1 mm's sword mark defect, and the partial discharge test under the variable frequency resonance condition specifically step as follows:
(1) test platform construction
Building a resonance voltage-withstanding and partial discharge test platform, as shown in fig. 1, connecting a cable core of a cable test article with the output of a variable frequency resonance system, connecting a cable shielding layer with the ground through a grounding wire, adopting a flat plate type antenna as a UHF sensor, facing a variable frequency power supply, keeping a distance d from the variable frequency power supply1Is 0.02m and is spaced from the cable specimen by a distance d2And the distance is 5m, so that the partial discharge signal in the cable test article cannot be detected by UHF due to long-distance attenuation, and only the interference of a variable frequency power supply is detected. The HFCT is buckled on a grounding wire led out from a cable terminal, and the interference of a variable frequency power supply can be collected simultaneouslyAnd cable partial discharge signals. The UHF and HFCT sensors are connected to the high-speed acquisition unit through coaxial cables and then transmitted to the data processing unit. In addition, the voltage divider signal is connected to the data acquisition unit as a trigger signal.
(2) Pulse extraction of two-way signals
And filtering out narrow-band interference in the original signal by software filtering. And then, respectively carrying out pulse extraction on the two paths of original data of the UHF sensor and the HFCT through a sliding time window. Setting a threshold value Vth1、Vth2And the time window length TwThe sliding step length is Tw/2，Vth1Is 2 times of white noise amplitude of signal measured by UHF sensor, Vth2Is 2 times of the white noise amplitude of the signal measured by HFCT, TwTake 1.5. mu.s. And taking an absolute value of the original signal, intercepting the acquired data by using a sliding time window, comparing the absolute value with a threshold value, recording the initial position of the time window as a pulse initial time when the data in the time window is larger than the threshold value, continuously moving the sliding window backwards until the data in the time window is smaller than the threshold value, and recording the initial position of the time window as a pulse termination time. Sliding the window to the end of the original data ends the pulse search. And finally obtaining UHF sensor and HFCT pulse and index sequence: pUHF＝[P1；P2；…； Pm]；PHFCT＝[P1；P2；…；Pn]；LocUHF＝[L1,L2,…,Lm,]，LocHFCT＝[L1,L2,…,Ln,]In which P isiRepresents a pulse sequence, LiM is the number of pulses detected by the UHF sensor and n is the number of pulses detected by the HFCT, which is the index of the corresponding pulse in the raw data.
(3) Interference pulse cancellation
Judging whether the pulse signal position acquired by HFCT and the pulse signal position acquired by UHF have intersection, namely judging LocHFCTi∩LocUHF(i∈[1,2,…,n]) Whether it is an empty set or not, if it is an empty set, note PHFCTiFor effective pulsing, the Loc is reservedHFCTi(ii) a If it is not an empty set, then note PHFCTiTo disturb pulseFlushing, deleting PHFCTi、LocHFCTi。
(4) Partial discharge source discrimination
Extracting P by collecting 100 sine period dataHFCTAnd drawing a local discharge phase spectrogram by using the single pulse peak value and the corresponding index, and judging the type of the local discharge source according to the spectrogram mode.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (6)
1. A partial discharge test platform under power cable frequency conversion series resonance, its characterized in that, the platform includes:
a variable frequency resonance system and a partial discharge test system; the variable frequency resonant system comprises: the device comprises a variable frequency power supply, an excitation transformer, a voltage divider and a reactor; the variable frequency power supply generates a sine wave with resonant frequency, an exciting transformer boosts the output voltage of the variable frequency power supply, an input reactor and a cable test article form an inductance-capacitance series resonance loop after boosting, a voltage divider measures the voltage of the high-voltage end of the cable test article, and a measured voltage signal is used as an output adjusting signal of the variable frequency power supply and a trigger signal of a partial discharge test system;
the partial discharge test system includes: the device comprises a partial discharge sensor, a current transformer, an acquisition unit and a data processing unit; the acquisition unit is provided with a plurality of acquisition channels for respectively acquiring a voltage divider output signal, a partial discharge sensor output signal and a current transformer output signal; the data processing unit processes and stores the data acquired by the acquisition unit;
the partial discharge sensor faces the variable frequency power supply and faces away from the cable test article, and the distance between the partial discharge sensor and the variable frequency power supply is d1The distance between the partial discharge sensor and the cable test article is d2Wherein, take d1<5cm，d2>1m；
The data processing unit is used for filtering an input original signal, filtering narrow-band interference in the original signal, and respectively performing pulse extraction on two paths of data of the local discharge sensor and the current transformer through a sliding time window after filtering;
setting a threshold value Vth1、Vth2And the time window length TwThe sliding step length is Tw/2，Vth1Is 2 times of the white noise amplitude of the signal measured by the partial discharge sensor, Vth2Is 2 times of the white noise amplitude of the signal measured by the current transformer, TwTaking 1-2 mu s; taking an absolute value of the filtered original signal, intercepting the acquired data by using a sliding time window, comparing the absolute value with a threshold value, recording the initial position of the time window as a pulse initial time when the data in the time window is greater than the threshold value, continuously moving the sliding window backwards until the data in the time window is less than the threshold value, and recording the initial position of the time window as a pulse termination time; sliding the sliding window to the tail end of the original data to finish pulse search, and finally obtaining a pulse and index sequence of the partial discharge sensor and the current transformer: pUHF＝[P1；P2；…；Pm]；PHFCT＝[P1；P2；…；Pn]；LocUHF＝[L1,L2,…,Lm]，LocHFCT＝[L1,L2,…,Ln]In which P isiRepresents a pulse sequence, LiThe index of the corresponding pulse in the original data is shown, m is the number of pulses detected by a UHF sensor, the UHF sensor is a partial discharge sensor, n is the number of pulses detected by an HFCT (high frequency current transformer), n is not less than m, and the original data is data obtained by taking the absolute value of the filtered original signal;
the data processing unit is used for eliminating interference pulses, and specifically comprises:
judging whether the pulse signal position acquired by HFCT and the pulse signal position acquired by UHF have intersection, namely judging LocHFCTi∩LocUHF(i∈[1,2,…,n]) Whether it is an empty set or not, if it is an empty set, note PHFCTiFor effective pulsing, the Loc is reservedHFCTi(ii) a If it is not an empty set, then note PHFCTiFor disturbing pulses, deleting PHFCTi、LocHFCTiThe UHF sensor is a partial discharge sensor, n is the number of pulses detected by HFCT, and HFCT is a current transformer;
the partial discharge sensor is used for collecting interference pulses of the variable frequency power supply: the current transformer is buckled on a grounding wire led out from a test article cable terminal or a test article cable body, and meanwhile, the interference of a variable frequency power supply and a cable partial discharge signal are collected.
2. The power cable partial discharge test platform under variable frequency series resonance according to claim 1, wherein the output of the variable frequency power supply is connected with an excitation transformer, the excitation transformer is connected with one end of a reactor, the other end of the reactor is connected with the high voltage side of a voltage divider and a cable core of a cable test article, a shielding layer of the test article cable is connected with the ground through a ground wire, and the output end of the voltage divider is connected with a corresponding acquisition channel in the acquisition unit.
3. The platform for testing partial discharge of a power cable under variable frequency series resonance according to claim 1, wherein the partial discharge sensor is an Ultra High Frequency (UHF) sensor, and a flat plate antenna is adopted; the current transformer is a high-frequency current sensor, namely HFCT, the structure of the current transformer is in a buckle type, and the output end of the current transformer is connected with a corresponding acquisition channel in the acquisition unit.
4. The power cable frequency conversion series resonance partial discharge test platform according to claim 1, wherein the data processing unit is configured to determine a type of a partial discharge source, and specifically includes:
by collecting a number of sinusoidal periodic data, P is extracted based on the collected dataHFCTSingle pulse peak and corresponding indexBased on PHFCTAnd extracting a local discharge phase spectrogram through the single pulse peak value and the corresponding index, and judging the type of the local discharge source according to the spectrogram mode.
5. The power cable variable frequency series resonance partial discharge test platform of claim 1, wherein the system further comprises a detector, and the output of the partial discharge sensor is connected to the detector.
6. The power cable frequency conversion series resonance partial discharge test platform according to claim 1, wherein an equalizing ring is additionally arranged at a high-voltage end of the reactor and a cable test article, and an anti-corona wire is used as a connecting wire.
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